How Thick Is Roofing Felt Paper

The most commonly used felts are 15 and 30 with weights of 8 and 20 pounds per 100 square feet.

How thick is roofing felt paper.

In order to know the appropriate amount of roofing felt to use the roof pitch will need to be calculated first. Roofing felt is comprised of a base made from natural materials such as wood cellulose or synthetic ones such as fiberglass or polyester and then coated or saturated with a protective coating such as bitumen asphalt which repels water but still allows the product to breathe. Roofing felt s thickness is actually measured in pounds per square with one square equaling 100 feet of roofing material. I have not found an exact citation but i believe you ll find the discussion of felt underlayment in the earliest roofing codes.

Roofing felt also known as tar paper is a roll of felt coverage is often used when constructing a roof. Asphalt saturated heavy duty roofing felt is available in 15 and 30 pound weights. It provides extra waterproofing to protect the wood until shingles are installed. Roofing felt s thickness is actually measured in pounds per square with one square equaling 100 feet of roofing material.

Building codes date from 1859 baltimore md. Tar paper comes in two different weights or thicknesses. 30 pound roofing felt it is not paper it s made from either fiberglass or polyester that s been bound together with asphalt costs the same per roll as 15 pound felt but there are 216 square. Taking the time to properly prepare the sheathing will make all the difference in how quickly and easily the felt paper is installed.

The history of tar paper or roofing felt goes back to at least the 1800 s. The lowest thickness is 15 pound felt. Thickness roofing felt s thickness is not a measurement of its depth because it is thin similar to heavy paper. These thick layers of roofing felt are installed by heating the back of the felt with a butane torch and then carefully applying it to the roof.

This weight of tar paper may tear and tends to create holes around the roofing nails. Installing the roofing felt does take care but can go very quickly. 30 pound roofing felt it is not paper it s made from either fiberglass or polyester that s been bound together with asphalt costs the same per roll as 15 pound felt but there are 216 square. This means that 100 square feet of the felt weighs 15 pounds.